Your solution doesn't quite work. The sum of all the counts in %one, %two and %three should be 600_000, 599_999 and 599_998 respectively, but you end up with 600_000 in all three. Specifically, you end up with one extra substr($sequence, -1) and two extra substr($sequence, -2). (Also, it requires Perl 5.8.0 or higher.)

In reply to Re^2: Question about speeding a regexp count by ikegami
in thread Question about speeding a regexp count by Commander Salamander

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